My Inquiry
My Account
Nexperia USA Inc. BZX84W-C12-QF
- Part No.:
- BZX84W-C12-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C12-QF.pdf
- Description:
- DIODE ZENER 12.05V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,617
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84W-C12-QF from Nexperia is a ±5% tolerance Zener diode in SOT323 (SC-70) package, rated for 12 V nominal regulation at 5 mA, with 150 Ω typical differential resistance and 8.4 mV/K temperature coefficient. It delivers 275 mW total power dissipation on FR4 PCB and supports automotive-grade voltage reference and overvoltage clamping in compact power management circuits.
For engineers reviewing the BZX84W-C12-QF datasheet, BZX84W-C12-QF pinout, BZX84W-C12-QF application, or BZX84W-C12-QF equivalent, this page provides verified Zener voltage, thermal resistance, reverse leakage, forward voltage, and AEC-Q101 qualification status to support automotive and high-frequency regulation design decisions.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal working voltage of 12 V at IZ = 5 mA, exhibiting 150 Ω typical differential resistance and 8.4 mV/K temperature coefficient across 25–150 °C. Its 100 nA reverse current at VR = 8 V ensures low standby loss in precision biasing networks.
Designed for surface-mount use in SOT323, it features a three-terminal configuration with anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3), enabling unidirectional voltage clamping without parasitic conduction paths. Thermal resistance from junction to ambient is 455 K/W under standard FR4 mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 11.4 V to 12.7 V at IZ = 5 mA - defines stable regulation window for 12 V rail referencing |
| Differential Resistance rdif | 150 Ω max at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Reverse Current IR | 100 nA max at VR = 8 V - enables low-power standby operation in battery-backed circuits |
| Forward Voltage VF | 0.9 V max at IF = 10 mA - limits forward conduction loss during transient polarity reversal |
| Total Power Dissipation Ptot | 275 mW on FR4 PCB - sets maximum continuous power handling in standard layout |
| Junction Temperature Tj | −55 °C to +150 °C - supports operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive discrete semiconductor stress testing per AEC standard |
Pinout & Package
SOT323 (SC-70) leadless plastic surface-mount package with 3 terminals, 1.3 mm × 1.8 mm footprint, and 0.65 mm pitch; optimized for reflow soldering with defined land pattern per Figure 9.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node during regulation |
| 2 | Not Connected | Electrically isolated; no internal bond wire or die connection - must remain floating |
| 3 | Cathode | Reverse-biased terminal; connects to higher-potential node for Zener breakdown operation |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables cost-effective voltage reference selection where tight regulation is not required |
| AEC-Q101 qualification | Validates reliability for automotive body control modules, lighting drivers, and sensor interfaces |
| 275 mW power rating on FR4 | Supports sustained regulation in space-constrained consumer and industrial PCBs without heatsinking |
| 100 nA reverse leakage at 8 V | Minimizes quiescent current draw in always-on monitoring circuits and low-power microcontroller reset networks |
| SOT323 ultra-small footprint | Reduces board area by >50% vs. SOT23 while maintaining compatible reflow profiles |
Applications
| Automotive ECU Voltage Reference | Industrial Sensor Bias Network |
|---|---|
Use Scenario: Providing stable 12 V reference for analog-to-digital converter input scaling in engine control units. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precise DC offset for signal conditioning circuitry. Use Value: 8.4 mV/K temperature coefficient and AEC-Q101 qualification ensure consistent ADC accuracy across −40 °C to +125 °C operating range. |
Use Scenario: Biasing bridge sensors in pressure transmitters requiring low-drift excitation voltage. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining constant current through Wheatstone bridge elements. Use Value: 150 Ω differential resistance minimizes output voltage shift under varying bridge loading conditions. |
| USB Port Overvoltage Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamping transient surges on 5 V USB VBUS lines to protect downstream USB PHY ICs. IC Role / Device Role / Timing Role: Fast-response shunt protector diverting ESD and load-dump energy away from sensitive interface ICs. Use Value: 40 W non-repetitive peak reverse power dissipation handles 100 µs surge pulses without degradation. |
Use Scenario: Generating clean, noise-immune reset signal for ARM Cortex-M MCUs during brown-out events. IC Role / Device Role / Timing Role: Zener-based threshold detector triggering external reset supervisor ICs. Use Value: 100 nA reverse leakage prevents capacitor discharge delay, ensuring timely reset assertion below 2.7 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C12-Q | Same electrical specs and SOT323 package; differs only in marking code (R6% vs QF) | Identical functional behavior; QF suffix indicates specific Nexperia manufacturing site and traceability | Select QF for full lot traceability in automotive production; Q is suitable for general industrial use |
| MMSZ5242B-TP | 12 V ±5%, 500 mW rating, SOD-123 package; 3× larger footprint and 2× higher power dissipation | Higher thermal margin but incompatible with dense SOT323 layouts; lacks AEC-Q101 certification | Choose only when board-level thermal constraints exceed 275 mW or AEC-Q101 is not required |
Compared with BZX84W-C12-QF, the Q variant offers identical performance with reduced traceability, while MMSZ5242B-TP trades miniaturization and automotive qualification for higher power handling in less space-constrained designs.
Availability
BZX84W-C12-QF is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, USB protection circuits, and microcontroller reset networks requiring stable component supply with full AEC-Q101 compliance and lot-level traceability.
Supply support for BZX84W-C12-QF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZX84W-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for stable voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage before breakdown for BZX84W-C12-QF?
The BZX84W-C12-QF has a nominal Zener voltage of 12 V at 5 mA test current, with guaranteed minimum and maximum values of 11.4 V and 12.7 V respectively. Breakdown begins within this range and is not defined by a single "maximum reverse voltage" - operation above 12.7 V increases power dissipation and requires thermal verification per the 275 mW limit.
Can BZX84W-C12-QF replace a 1N4742A in existing designs?
No - the 1N4742A is a 12 V, 1 W through-hole Zener in DO-41 package, while BZX84W-C12-QF is a 12 V, 275 mW SOT323 device with different thermal behavior and layout requirements. Direct replacement requires verifying power derating, PCB copper area, and mechanical fit; it is not a drop-in substitute.
Is Pin 2 internally connected or should it be left unconnected on the PCB?
Pin 2 is explicitly marked "n.c." (not connected) in Nexperia's official pinning diagram and has no internal die connection. It must remain electrically floating - neither soldered nor tied to ground or any other net - to avoid unintended parasitic paths or thermal stress.
Does the 455 K/W thermal resistance apply to all PCB configurations?
No - the 455 K/W value is measured on a standard FR4 PCB with single-sided 1 oz copper, tin-plated, and Nexperia's recommended footprint. Adding thermal vias, double-sided copper, or thermal pads reduces Rth(j-a); using thinner copper or smaller pads increases it. Derating must follow actual board construction.
BZX84W-C12-QF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W-Q
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12.05 V
- Tolerance:
- ±5.39%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-C12-QF FAQ
1.How can I place an order for BZX84W-C12-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C12-QF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BZX84W-C12-QF reliable?
The price and inventory of BZX84W-C12-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C12-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-C12-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C12-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C12-QF?
BZX84W-C12-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C12-QF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BZX84W-C12-QF?
For technical support, including BZX84W-C12-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C12-QF requirements.
6.How does Aetrix verify that BZX84W-C12-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-C12-QF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZX84W-C12-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-C12-QF?
All BZX84W-C12-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C12-QF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BZX84W-C12-QF part is unused and in its original packaging.
Return procedure for BZX84W-C12-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C12-QF Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
